(7x^2+4x+8)+(4x^2-6x+4)=

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Solution for (7x^2+4x+8)+(4x^2-6x+4)= equation:


Simplifying
(7x2 + 4x + 8) + (4x2 + -6x + 4) = 0

Reorder the terms:
(8 + 4x + 7x2) + (4x2 + -6x + 4) = 0

Remove parenthesis around (8 + 4x + 7x2)
8 + 4x + 7x2 + (4x2 + -6x + 4) = 0

Reorder the terms:
8 + 4x + 7x2 + (4 + -6x + 4x2) = 0

Remove parenthesis around (4 + -6x + 4x2)
8 + 4x + 7x2 + 4 + -6x + 4x2 = 0

Reorder the terms:
8 + 4 + 4x + -6x + 7x2 + 4x2 = 0

Combine like terms: 8 + 4 = 12
12 + 4x + -6x + 7x2 + 4x2 = 0

Combine like terms: 4x + -6x = -2x
12 + -2x + 7x2 + 4x2 = 0

Combine like terms: 7x2 + 4x2 = 11x2
12 + -2x + 11x2 = 0

Solving
12 + -2x + 11x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
11 the coefficient of the squared term: 

Divide each side by '11'.
1.090909091 + -0.1818181818x + x2 = 0

Move the constant term to the right:

Add '-1.090909091' to each side of the equation.
1.090909091 + -0.1818181818x + -1.090909091 + x2 = 0 + -1.090909091

Reorder the terms:
1.090909091 + -1.090909091 + -0.1818181818x + x2 = 0 + -1.090909091

Combine like terms: 1.090909091 + -1.090909091 = 0.000000000
0.000000000 + -0.1818181818x + x2 = 0 + -1.090909091
-0.1818181818x + x2 = 0 + -1.090909091

Combine like terms: 0 + -1.090909091 = -1.090909091
-0.1818181818x + x2 = -1.090909091

The x term is -0.1818181818x.  Take half its coefficient (-0.0909090909).
Square it (0.008264462808) and add it to both sides.

Add '0.008264462808' to each side of the equation.
-0.1818181818x + 0.008264462808 + x2 = -1.090909091 + 0.008264462808

Reorder the terms:
0.008264462808 + -0.1818181818x + x2 = -1.090909091 + 0.008264462808

Combine like terms: -1.090909091 + 0.008264462808 = -1.082644628192
0.008264462808 + -0.1818181818x + x2 = -1.082644628192

Factor a perfect square on the left side:
(x + -0.0909090909)(x + -0.0909090909) = -1.082644628192

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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